Page 12

7. Acknowledgements

The idea of an ESMTP extension to convey the identity of the
responsible sender of an e-mail message has many progenitors. Nick
Shelness suggested the idea in a private conversation with one of the
authors. Pete Resnick suggested a variant on the MARID mailing list.
The idea was also discussed on the Anti-Spam Research Group (ASRG)
mailing list.